I tried disabling the power management option in my BIOS, but no luck. The newer OS/2 kernel uses Int15 with EAX set to 0x0000E820, and if you look carefully you see that the ACPI has reserved about 9 K of memory, right smack in the middle. I get the impression OS/2 wants it’s memory to be contiguous, and hence only uses 64 Megs.

I installed a patch to the OS/2 kernel that replaces the BIOS call with Int15 (DA88). So now I have access to all my memory, but I’m a bit terrified that OS/2 will start using memory reserved by the ACPI, and the ACPI will start trouncing on my valuable data. But maybe with power management disabled the ACPI won’t be writing anything. … Maybe.